To answer this question, you need to understand the concept of mapping files in programming.
Option A) True - This option is incorrect. It is not possible to declare mappings for multiple classes in one mapping file.
Option B) False - This option is correct. It is not possible to declare mappings for multiple classes in one mapping file. Each class typically has its own separate mapping file.
The correct answer is B. It is not possible to declare mappings for multiple classes in one mapping file.